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<xs:schema targetNamespace="http://www.w3.org/XML/1998/namespace"
  xmlns:xs="http://www.w3.org/2001/XMLSchema"
  xmlns   ="http://www.w3.org/1999/xhtml"
  xml:lang="en">

  <xs:annotation>
    <xs:documentation>
      <div>
        <h1>About the XML namespace</h1>

        <div class="bodytext">
          <p>
            This schema document describes the XML namespace, in a form
            suitable for import by other schema documents.
          </p>
          <p>
            See <a href="http://www.w3.org/XML/1998/namespace.html">
              http://www.w3.org/XML/1998/namespace.html
            </a> and
            <a href="http://www.w3.org/TR/REC-xml">
              http://www.w3.org/TR/REC-xml
            </a> for information
            about this namespace.
          </p>
          <p>
            Note that local names in this namespace are intended to be
            defined only by the World Wide Web Consortium or its subgroups.
            The names currently defined in this namespace are listed below.
            They should not be used with conflicting semantics by any Working
            Group, specification, or document instance.
          </p>
          <p>
            See further below in this document for more information about <a
      href="#usage">
              how to refer to this schema document from your own
              XSD schema documents
            </a> and about <a href="#nsversioning">
              the
              namespace-versioning policy governing this schema document
            </a>.
          </p>
        </div>
      </div>
    </xs:documentation>
  </xs:annotation>

  <xs:attribute name="lang">
    <xs:annotation>
      <xs:documentation>
        <div>

          <h3>lang (as an attribute name)</h3>
          <p>
            denotes an attribute whose value
            is a language code for the natural language of the content of
            any element; its value is inherited.  This name is reserved
            by virtue of its definition in the XML specification.
          </p>

        </div>
        <div>
          <h4>Notes</h4>
          <p>
            Attempting to install the relevant ISO 2- and 3-letter
            codes as the enumerated possible values is probably never
            going to be a realistic possibility.
          </p>
          <p>
            See BCP 47 at <a href="http://www.rfc-editor.org/rfc/bcp/bcp47.txt">
              http://www.rfc-editor.org/rfc/bcp/bcp47.txt
            </a>
            and the IANA language subtag registry at
            <a href="http://www.iana.org/assignments/language-subtag-registry">
              http://www.iana.org/assignments/language-subtag-registry
            </a>
            for further information.
          </p>
          <p>
            The union allows for the 'un-declaration' of xml:lang with
            the empty string.
          </p>
        </div>
      </xs:documentation>
    </xs:annotation>
    <xs:simpleType>
      <xs:union memberTypes="xs:language">
        <xs:simpleType>
          <xs:restriction base="xs:string">
            <xs:enumeration value=""/>
          </xs:restriction>
        </xs:simpleType>
      </xs:union>
    </xs:simpleType>
  </xs:attribute>

  <xs:attribute name="space">
    <xs:annotation>
      <xs:documentation>
        <div>

          <h3>space (as an attribute name)</h3>
          <p>
            denotes an attribute whose
            value is a keyword indicating what whitespace processing
            discipline is intended for the content of the element; its
            value is inherited.  This name is reserved by virtue of its
            definition in the XML specification.
          </p>

        </div>
      </xs:documentation>
    </xs:annotation>
    <xs:simpleType>
      <xs:restriction base="xs:NCName">
        <xs:enumeration value="default"/>
        <xs:enumeration value="preserve"/>
      </xs:restriction>
    </xs:simpleType>
  </xs:attribute>

  <xs:attribute name="base" type="xs:anyURI">
    <xs:annotation>
      <xs:documentation>
        <div>

          <h3>base (as an attribute name)</h3>
          <p>
            denotes an attribute whose value
            provides a URI to be used as the base for interpreting any
            relative URIs in the scope of the element on which it
            appears; its value is inherited.  This name is reserved
            by virtue of its definition in the XML Base specification.
          </p>

          <p>
            See <a
        href="http://www.w3.org/TR/xmlbase/">http://www.w3.org/TR/xmlbase/</a>
            for information about this attribute.
          </p>
        </div>
      </xs:documentation>
    </xs:annotation>
  </xs:attribute>

  <xs:attribute name="id" type="xs:ID">
    <xs:annotation>
      <xs:documentation>
        <div>

          <h3>id (as an attribute name)</h3>
          <p>
            denotes an attribute whose value
            should be interpreted as if declared to be of type ID.
            This name is reserved by virtue of its definition in the
            xml:id specification.
          </p>

          <p>
            See <a
        href="http://www.w3.org/TR/xml-id/">http://www.w3.org/TR/xml-id/</a>
            for information about this attribute.
          </p>
        </div>
      </xs:documentation>
    </xs:annotation>
  </xs:attribute>

  <xs:attributeGroup name="specialAttrs">
    <xs:attribute ref="xml:base"/>
    <xs:attribute ref="xml:lang"/>
    <xs:attribute ref="xml:space"/>
    <xs:attribute ref="xml:id"/>
  </xs:attributeGroup>

  <xs:annotation>
    <xs:documentation>
      <div>

        <h3>Father (in any context at all)</h3>

        <div class="bodytext">
          <p>
            denotes Jon Bosak, the chair of
            the original XML Working Group.  This name is reserved by
            the following decision of the W3C XML Plenary and
            XML Coordination groups:
          </p>
          <blockquote>
            <p>
              In appreciation for his vision, leadership and
              dedication the W3C XML Plenary on this 10th day of
              February, 2000, reserves for Jon Bosak in perpetuity
              the XML name "xml:Father".
            </p>
          </blockquote>
        </div>
      </div>
    </xs:documentation>
  </xs:annotation>

  <xs:annotation>
    <xs:documentation>
      <div xml:id="usage" id="usage">
        <h2>
          <a name="usage">About this schema document</a>
        </h2>

        <div class="bodytext">
          <p>
            This schema defines attributes and an attribute group suitable
            for use by schemas wishing to allow <code>xml:base</code>,
            <code>xml:lang</code>, <code>xml:space</code> or
            <code>xml:id</code> attributes on elements they define.
          </p>
          <p>
            To enable this, such a schema must import this schema for
            the XML namespace, e.g. as follows:
          </p>
          <pre>
            &lt;schema . . .>
            . . .
            &lt;import namespace="http://www.w3.org/XML/1998/namespace"
            schemaLocation="http://www.w3.org/2001/xml.xsd"/>
          </pre>
          <p>
            or
          </p>
          <pre>
            &lt;import namespace="http://www.w3.org/XML/1998/namespace"
            schemaLocation="http://www.w3.org/2009/01/xml.xsd"/>
          </pre>
          <p>
            Subsequently, qualified reference to any of the attributes or the
            group defined below will have the desired effect, e.g.
          </p>
          <pre>
            &lt;type . . .>
            . . .
            &lt;attributeGroup ref="xml:specialAttrs"/>
          </pre>
          <p>
            will define a type which will schema-validate an instance element
            with any of those attributes.
          </p>
        </div>
      </div>
    </xs:documentation>
  </xs:annotation>

  <xs:annotation>
    <xs:documentation>
      <div id="nsversioning" xml:id="nsversioning">
        <h2>
          <a name="nsversioning">Versioning policy for this schema document</a>
        </h2>
        <div class="bodytext">
          <p>
            In keeping with the XML Schema WG's standard versioning
            policy, this schema document will persist at
            <a href="http://www.w3.org/2009/01/xml.xsd">
              http://www.w3.org/2009/01/xml.xsd
            </a>.
          </p>
          <p>
            At the date of issue it can also be found at
            <a href="http://www.w3.org/2001/xml.xsd">
              http://www.w3.org/2001/xml.xsd
            </a>.
          </p>
          <p>
            The schema document at that URI may however change in the future,
            in order to remain compatible with the latest version of XML
            Schema itself, or with the XML namespace itself.  In other words,
            if the XML Schema or XML namespaces change, the version of this
            document at <a href="http://www.w3.org/2001/xml.xsd">
              http://www.w3.org/2001/xml.xsd
            </a>
            will change accordingly; the version at
            <a href="http://www.w3.org/2009/01/xml.xsd">
              http://www.w3.org/2009/01/xml.xsd
            </a>
            will not change.
          </p>
          <p>
            Previous dated (and unchanging) versions of this schema
            document are at:
          </p>
          <ul>
            <li>
              <a href="http://www.w3.org/2009/01/xml.xsd">
                http://www.w3.org/2009/01/xml.xsd
              </a>
            </li>
            <li>
              <a href="http://www.w3.org/2007/08/xml.xsd">
                http://www.w3.org/2007/08/xml.xsd
              </a>
            </li>
            <li>
              <a href="http://www.w3.org/2004/10/xml.xsd">
                http://www.w3.org/2004/10/xml.xsd
              </a>
            </li>
            <li>
              <a href="http://www.w3.org/2001/03/xml.xsd">
                http://www.w3.org/2001/03/xml.xsd
              </a>
            </li>
          </ul>
        </div>
      </div>
    </xs:documentation>
  </xs:annotation>

</xs:schema>
